package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //1、判断购物车表是否有该记录
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //2、有该记录，则数量+1
        if (list != null && list.size() > 0) {
            //则说明有记录
            ShoppingCart cart = list.get(0);
            //查出的记录需要在加1
            cart.setNumber(cart.getNumber() + 1);
            //将数量改变的购物车记录更新一下
            shoppingCartMapper.updateNumberById(cart);
        }

        //3、没有该记录，则添加该记录
        Long dishId = shoppingCartDTO.getDishId();
        if (dishId != null) {
            //则说明传过来的是菜品
            Dish dish = dishMapper.selectById(dishId);
            shoppingCart.setName(dish.getName());
            shoppingCart.setImage(dish.getImage());
            shoppingCart.setAmount(dish.getPrice());
        } else {
            //说明传过来的是套餐
            Long setmealId = shoppingCart.getSetmealId();
            Setmeal setmeal = setmealMapper.selectById(setmealId);
            shoppingCart.setName(setmeal.getName());
            shoppingCart.setImage(setmeal.getImage());
            shoppingCart.setAmount(setmeal.getPrice());
        }
        shoppingCart.setNumber(1);
        shoppingCart.setCreateTime(LocalDateTime.now());
        shoppingCartMapper.insert(shoppingCart);

    }

    /**
     * 查看购物车
     *
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> shoppingCarts = shoppingCartMapper.list(shoppingCart);
        return shoppingCarts;
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }


    /**
     * 删除购物车中的一个商品
     *
     * @param shoppingCartDTO
     */
    public void delete(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCartMapper.deleteByDishOrSetmealId(shoppingCart);
    }
}
